[TenTec] OMNI VI DC power PC board failure ?

[Steve Ellington]

Q1 is just a transistor switch that triggers the relay coil. If the relay
is buzzing you must be putting ripple on it and that comes right out of
your power supply, 13.8v. I don't see why changing capacitors would be the
first thing. Things happen for a reason. Use the scope and look at your DC
or just try another power supply or try that power supply on another radio.
Step 1 first.

Steve N4LQ

On Thu, Dec 1, 2016 at 10:05 AM, Wade Staggs <tvman1954 at gmail.com> wrote:

> The standard repair for the problem with this PSU Board, is to replace
> ALL of the Capacitors on that board.
>                                         73,  Wade/KJ4WS
>
> On 12/1/16, Steve Ellington <steven4lq at gmail.com> wrote:
> > Sounds to me like your power supply is bad.
> >
> > On Thu, Dec 1, 2016 at 9:19 AM, David Perrin <dbperrin at gmail.com> wrote:
> >
> >> Hi-
> >>  I have an OMNI VI that started to fail; the readout began to flash and
> >> the
> >> relay on the DC power board (about 2.5" square) began buzzing. I
> replaced
> >> the 1000uF cap @ 25V with one of the same cap. but a voltage rating of
> >> 50V.
> >> That increased the frequency of the buzzing by about twice the
> frequency.
> >> Transistors replaced, a 1N4001 diode replaced as well. 0.15 Ohm resistor
> >> is
> >> OK. Next will be to replace the 16V Zener.
> >>
> >> Any clues would be appreciated, or maybe there is a DC power board out
> >> there somewhere.
> >>
> >> Thanks for reading.
> >>
> >> 73 de Dave in NH  K1OPQ
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